Question

​Claim: Fewer than 93​% of adults have a cell phone. In a reputable poll of 1061 ​adults, 83​% said that they have a cell phone. Find the value of the test statistic.

Answer 1

Solution:

Given that,

= 0.83

1 - P0 = 0.07

Test statistic = z

= - P0 / [P0 * (1 - P0 ) / n]

= 0.83 - 0.93 / [(0.93 * 0.07) / 1061]

= -12.77

Test Statistic = - 12.77